Derek Williams, 51, has been spending a lot of time thinking about certain numbers.
He committed 12 armed robberies in and around Milwaukee 30 years ago. In 1997, the North Side native was sentenced to 15 years in prison for each robbery – a total of 180 years.
In 2023, a Milwaukee County judge cut that sentence in half after Williams stopped an attack of a correctional officer who was being stabbed with a sharpened pen. The reduction in his sentence made Williams eligible for parole…